SKU: CSN231
Spec Stage 1 Clutch Kit – Nissan Skyline RB20DET (R32/R33) Manual Transmission Only
The Spec Stage 1 clutch kit for the Nissan RB20DET engine provides increased torque capacity and improved drivability for mild to moderate performance builds. Featuring a high-clamp load pressure plate and a reinforced full-face organic disc with steel-backed linings, this kit delivers smooth engagement, quiet operation, and reliable holding power up to 400+ ft-lbs while maintaining near-stock pedal feel perfect for daily-driven Skylines with bolt-ons, cams, or light turbo upgrades.
Key Features
- High-Clamp Pressure Plate: Increased clamp load with reinforced drive straps and marcel spring for durability.
- Steel-Backed Organic Disc: Full-face organic material on both sides with sprung hub for smooth engagement and reduced shock.
- Torque Capacity: Rated for 400+ ft-lbs at the wheels (depending on tune and traction).
- Alignment Tool & Pilot Bearing: Included for precise installation.
- Release Bearing: High-quality throw-out bearing included.
- Hand-Assembled & Balanced: Every kit tested for balance and clamp load.
- Flywheel Not Included: Uses stock flywheel or lightweight upgrade.
- Made in USA: Manufactured by Spec Clutches in Bessemer, Alabama.
Product Notes
- Part number: CSN231 (Stage 1 for RB20DET).
- Flywheel NOT included – requires stock or lightweight flywheel (Spec billet steel recommended).
- Compatible with factory hydraulic release system.
- Pedal effort approximately 15-20% stiffer than stock – very street-friendly.
- Recommended for street, autocross, and light track use.
- Kit weight approximately 22-25 lbs.
- Limited 1-year / 12,000-mile warranty (no racing coverage).
Installation Notes
- Direct replacement transmission removal required.
- Professional installation recommended.
- Break-in procedure: 500 miles gentle driving before aggressive use.
- Typical install time 6-8 hours.
This Part Fits
| Year | Make | Model | Engine | Transmission |
|---|---|---|---|---|
| 1989-1993 | Nissan | Skyline R32 GTS-t | RB20DET | 5-Speed Manual |
| 1993-1998 | Nissan | Skyline R33 GTS-t | RB20DET | 5-Speed Manual |
| Universal | Nissan | RB20DET Swaps | RB20DET | 5-Speed Manual |
Why Choose Spec Stage 1?
- 30+ years specializing in high-performance clutch systems for Nissan RB engines.
- Stage 1 proven on 300-450hp RB20DET street cars worldwide.
- Steel-backed organic disc provides smooth engagement and long life.
Frequently Asked Questions
- Q: Does this include a flywheel?
A: No, flywheel is not included. Uses stock flywheel or lightweight upgrade. - Q: How much pedal effort increase?
A: Approximately 15-20% stiffer – very comfortable for daily driving. - Q: Will this work with RB25DET?
A: No, RB25DET requires different kit (CSN232).
Shipping & Handling
- Method: Standard ground shipping.
- Package Weight: Approximately 28–32 lbs.
- Box Dimensions (approx): 16″ × 16″ × 8″.
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